This instrument complies with CAT I safety requirements.
To ensure safe operation of measurement instruments, IEC
61010 establishes safety standards for various electrical envi-
ronments, categorized as CAT I to CAT IV, and called measure-
ment categories. These are defined as follows.
Higher-numbered categories correspond to electrical environ-
ments with greater momentary energy. So a measurement
device designed for CAT III environments can endure greater
momentary energy than a device designed for CAT II.
Using a measurement instrument in an environment designated
with a higher-numbered category than that for which the instru-
ment is rated could result in a severe accident, and must be
carefully avoided. Never use a CAT I measuring instrument in
CAT II, III, or IV environments.
The measurement categories comply with the Overvoltage Cate-
gories of the IEC60664 Standards.
Measurement Categories (Overvoltage Categories)
CAT I: Secondary electrical circuits connected to an AC
electrical outlet through a transformer or similar de-
vice.
CAT II: Primary electrical circuits in equipment connected
to an AC electrical outlet by a power cord (portable
tools, household appliances, etc.)
CAT III: Primary electrical circuits of heavy equipment (fixed
installations) connected directly to the distribution
panel, and feeders from the distribution panel to
outlets.
CAT IV: The circuit from the service drop to the service en-
trance, and to the power meter and primary over-
current protection device (distribution panel).
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